poorness vs spareness

poorness and spareness both are nouns.

Word	Noun	Adjective	Verb	Adverb
poorness	Yes	No	No	No
spareness	Yes	No	No	No

As nouns, spareness is a hyponym of poorness; that is, spareness is a word with a more specific, narrower meaning than poorness:

Other hyponyms of poorness include wateriness, abstemiousness, sparseness, sparsity, thinness, thinness.

poorness (noun)	spareness (noun)
the quality of being poorly made or maintained	the property of being scanty or scattered; lacking denseness
less than adequate	the property of having little body fat
the quality of being meager
the state of having little or no money and few or no material possessions